Hi there! I have three female mice that all get along well, but one is pregnant. Is it ok for her to give birth living with the other mice? I’m worried that the others will end up killing them by sleeping on top of them or something they all share the same nest and sleep in a pile.

It is most often recommended, especially with mice from unknown lines, to separate mom before she gives birth. Some do use “nannies” but things can go very wrong. There is more info in the Breeding Packet.